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Chapter 4. Cluster Creation and Administration
This chapter describes how to perform basic cluster administration with Pacemaker, including creating the cluster, managing the cluster components, and displaying cluster status.
4.1. Cluster Creation
To create a running cluster, perform the following steps:
- Start the
pcsdon each node in the cluster. - Authenticate the nodes that will constitute the cluster.
- Configure and sync the cluster nodes.
- Start cluster services on the cluster nodes.
The following sections described the commands that you use to perform these steps.
4.1.1. Starting the pcsd daemon
The following commands start the
pcsd service and enable pcsd at system start. These commands should be run on each node in the cluster.
#systemctl start pcsd.service#systemctl enable pcsd.service
4.1.2. Authenticating the Cluster Nodes
The following command authenticates
pcs to the pcs daemon on the nodes in the cluster.
- The user name for the
pcsadministrator must behaclusteron every node. It is recommended that the password for userhaclusterbe the same on each node. - If you do not specify
usernameorpassword, the system will prompt you for those parameters for each node when you execute the command. - If you do not specify any nodes, this command will authenticate
pcson the nodes that are specified with apcs cluster setupcommand, if you have previously executed that command.
pcs cluster auth [node] [...] [-u username] [-p password]
For example, the following command authenticates user
hacluster on z1.example.com for both of the nodes in the cluster that consist of z1.example.com and z2.example.com. This command prompts for the password for user hacluster on the cluster nodes.
root@z1 ~]# pcs cluster auth z1.example.com z2.example.com
Username: hacluster
Password:
z1.example.com: Authorized
z2.example.com: Authorized
Authorization tokens are stored in the file
~/.pcs/tokens (or /var/lib/pcsd/tokens).
4.1.3. Configuring and Starting the Cluster Nodes
The following command configures the cluster configuration file and syncs the configuration to the specified nodes.
- If you specify the
--startoption, the command will also start the cluster services on the specified nodes. If necessary, you can also start the cluster services with a separatepcs cluster startcommand.When you create a cluster with thepcs cluster setup --startcommand or when you start cluster services with thepcs cluster startcommand, there may be a slight delay before the cluster is up and running. Before performing any subsequent actions on the cluster and its configuration, it is recommended that you use thepcs cluster statuscommand to be sure that the cluster is up and running. - If you specify the
--localoption, the command will perform changes on the local node only.
pcs cluster setup [--start] [--local] --name cluster_ name node1 [node2] [...]
The following command starts cluster services on the specified node or nodes.
- If you specify the
--alloption, the command starts cluster services on all nodes. - If you do not specify any nodes, cluster services are started on the local node only.
pcs cluster start [--all] [node] [...]
